Update changelog for 2.1.0+repack-1 release

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Status Job ID Name Coverage
  Build
passed #158239
build

00:03:01

 
  Test
passed #158242
blhc

00:01:32

passed #158241
lintian

00:01:59

passed #158243
piuparts

00:03:07

passed #158240
reprotest

00:02:38